Charles william pinkney



(No Model.)

0. W. PINKNEY. GAS ENGINE. No. 504,614. Patented Sept. 5, 1898.

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UNITED STATES PATENT OEFicE.

CHARLES WILLIAM PINKNEY, OF SMETIIXVICK, ASSIGNOR OF TlVO-THIRDS TO GEORGE TANGYE AND GEORGE I'IANDEL HASXVELL,,OF BIRMINGHAM, ENGLAND.

Gas-Enema SPECIFICATION forming part of Letters Patent No. 504,614, dated September 5, 1893.

Application filed February 13,1893. Serial No. 462,189. (No model.)

To all whom it may concern: engine, before they pass through the exhaust Beitknown that I, CHARLES WILLIAM PINK- valve 1;, to the outlet 1), has a passage 29* NEY, mechanical engineer, a subject of the therefrom which leads, by the pipe 0, into a Queen of Great Britain and Ireland, residing cylinder, or vesselD, in which moves a piston at 77 Raglan Road, Smethwick, in the county E having attached to it a rod 6, which, when 55 of Stafford, England, have invented certain the piston E is in its elevated position, brings Improvements in Gas-Engines, of which the a lever F, centered at f, on the end of the exfollowing is a specification. haust valve spindle 5 into line with the rod My invention relates to gas engines which G, having a jointed end portion or rod g with work on what is known as the Otto cycle, a mouth shaped termination thrust rearward 60 and the object of my invention is to simplify by the crank shaft. This is shown as being efthe engine by reducing the number of workfected by a cam h on the crank shaft H acting ing parts, as I dispense with the ordinary on a roller g on the said rod Gthe crank shaft gearing wheels, side shaft, brackets, valve leend of which is bifurcated as shown to embrace I 5 vers, and the like, as hitherto used. the shaft H between the cam h and collar 7L2 I 5 The present invention will be fully underwhich act as a support and guides therefor. stood from the following description, refer- The other end of the rod Gis supported by aleence being made to the accompanying drawver g centered to the engine framing and havings forming part of this specification, in ing a pin 9 for the rod g to rest upon. g is a which spring which returns the rod G and its attach- 7o Figurelof the accompanyingdrawings isa ments after the cam It has acted upon it. horizontal section of so much of a gas engine )Vhen the engine is at work, as the piston as is necessary to explain the application of in the main cylinder A makes its charging my invention thereto. Fig. 2 shows in plan stroke the vacuum formed in the said main a part of the crank shaft and of the attachcylinder will, by the communication of the ment which operates the exhaust valve. Figs. exhaust box 13 by the pipe 0 with the cylin- 3, 4 and 5 show modifications of the device der or vessel D draw the said piston E down worked by the pressure of the charge and of or inward so that the lever F is not in line the explosion as hereinafter described. with the rods 9 Then the piston in the 30 The engine herein shown and described opermain cylinder returns and makes its compres- 8o ates on the four-stroke-cycle system, comprission stroke the pressure of the charge will ing (first) the charging stroke, (second) the cause the said piston E to rise or move outcompression stroke, which compresses the ward so that theleverFwill be finally brought gases drawn in by the charging stroke (third) into line with the rod 9 as hereinafter ex- 3 5 the working stroke caused by the explosion plained and as indicated by the dotted lines of the charge, and (fourth) the discharging the said lever F having a bearing piece f to stroke, for expelling the products of combus take the strain. As the piston (main-piston) tion. In the present invention the discharge advances during the compression stroke the valve remains closed during the charging, pressure on the piston E increases, the action 40 compression and working strokes, and is of the cam h at the same time advancing the opened during the discharge stroke, the operrod G. As the lever 13 is not however raised ating parts having been brought-into position to the line of extension 9 until at or near the for operative connection during the compresend of the compression stroke the extension sion stroke. At the end of the working stroke g misses the end of lever F, and rests on and 5 the parts drop by gravity into proper relative is raised by the latter during its ascent. At 5 position for contact and the discharge valve the end of the compression stroke the explois opened during the discharge stroke, as heresion of the working charge of the cylinder A inafter more fully explained. takes place the pressure still keeping the pis- The exhaust valve box 13 into which the ton E in its last named position. When the 59 gases pass from the working cylinder Aof the crank of the engine has arrived at the posi- 10c tion at which the exhaust valve should be.

opened, that is to say, at the beginning of the discharging stroke, the extension g having escaped the end of lever F and dropped by gravity into its normal position the rod G is by the cam 7L moved so that the mouth at the end of the rod g meets and acts upon the end of the lever F which is now in its path as shown by the dotted lines and the exhaust valve 1) is opened until the main piston has reached the end of its exhausting stroke when the exhaust valve closes and is held tightly to its seat by its spring I). The piston in the main cylinder A now commences to make its charging stroke and a vacuum will again be formed in the said main cylinder and the piston E will take such a position that the lever F is out of line with the rod g as shown in full lines and therefore although this portion of the revolution of the crank shaft corresponds with its position on the occurrence of the explosion the exhaust valve 1) will not be i opened as the end of the rod g will not abut against the lever F.

As before stated I do not limit myself to the precise details which I have illustrated as the attachment to the crank shaft and the attachment to the exhaust valve which is brought into line therewith may be arranged in any other convenient way. For example as shown in elevation and sectional plan respectively in Figs.8 and 4 the lever F may be replaced by a piece F sliding in guides b in the end of the exhaust valve rod 12 and acted upon by the rod 2 of the piston in the cylinder or vessel D to raise or lower the projection f to bring it into line with the attachment 9 to the crank shaft as indicated by the dotted lines in Fig. 3 it returning to its lower position by its own weight or under the action of a spring. Or I may use in place of the cylinder or vessel D a vessel D as shown in Fig. 5 having in it a diaphragm e to which the rod e is attached the said rod being weighted by the weight e to return the rod and diaphragm to their lowered positions. Or I may use any other suitable device such as a Bourdon steam gage on the tube of which the pressure acts as the steam acts in a Bourdon gage.

Having now particularly described and ascertained the nature of my said invention and in what manner the sameis to be performed, I declare that what I claim is- 1. In a gas engine the combination with the exhaust-valve and its stem, of a vertically movable connecting bar at the end of the valve-stem, a cylinder and piston or equivalent device in communication with the explosion chamber for raising the connecting bar as the pressure in said chamber is increased, an oscillating rod driven from the crank-shaft of the machine, and a vertically movable extension at the end of the oscillating rod adapted to be elevated by the connecting rod during the compression stroke and returned to its operative position by gravity, substantially as described.

2. In a gas engine the combination with the exhaust-valve and its stem, of a pivoted connecting bar at the end of said valve stem, a cylinder and piston or equivalent device in communication with the explosion chamber for moving said bar, an oscillating rod driven from the main crank shaft, and a pivoted extension at the end of said oscillating rod, adapted to be brought into operative contact with the connecting bar for operating the exhaust valve, substantially as described.

3. In agas engine the combination with the exhaust valve and its stem, of a connecting bar pivoted to the end of said valve-stem, a cylinder and piston or equivalent device cornmunicating with the explosion chamber for elevating the connecting bar to its operative position, an oscillating rod driven from the main shaft of the machine, a swinging support for the outer end of said rod and a pivoted extension at said outer end normally supported in alignment for engagement with the connecting bar when the latter is elevated to its operative position, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES XVILLIAM PINKNEY.

\Vitnesses:

JAMES ROBSON,

48 Linwood Road, Hcmdsworth.

EDWARD J. HODGKINS,

208 -Westmt'nster Road, Handsworth. 

